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That means then that each child process will have to consume x amount of data space for making the memory mapping?
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That means then that each child process will have to consume x amount of data space for making the memory mapping?

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no, the child process wont actually consume any more pyhisical memory, it will just map the region into its virtual memory
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no, the child process wont actually consume any more pyhisical memory, it will just map the region into its virtual memory

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I have a clients - server setup that are both attaching to a shared memory segment created by the server.<br />
If I use shmat on the clients process, using ofcourse the same shmid, shmat is returning a differnce <br />
address than the server one. <br />
e.g Server address=80C00000 and client address=81000000 
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I have a clients - server setup that are both attaching to a shared memory segment created by the server.
If I use shmat on the clients process, using ofcourse the same shmid, shmat is returning a differnce 
address than the server one. 
e.g Server address=80C00000 and client address=81000000 

Shared Memory (Ansi C- Sco Unix), shmat address

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.

Unix OS

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.